1*404b540aSrobert // Allocator that wraps operator new -*- C++ -*- 2*404b540aSrobert 3*404b540aSrobert // Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 4*404b540aSrobert // 5*404b540aSrobert // This file is part of the GNU ISO C++ Library. This library is free 6*404b540aSrobert // software; you can redistribute it and/or modify it under the 7*404b540aSrobert // terms of the GNU General Public License as published by the 8*404b540aSrobert // Free Software Foundation; either version 2, or (at your option) 9*404b540aSrobert // any later version. 10*404b540aSrobert 11*404b540aSrobert // This library is distributed in the hope that it will be useful, 12*404b540aSrobert // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*404b540aSrobert // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*404b540aSrobert // GNU General Public License for more details. 15*404b540aSrobert 16*404b540aSrobert // You should have received a copy of the GNU General Public License along 17*404b540aSrobert // with this library; see the file COPYING. If not, write to the Free 18*404b540aSrobert // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19*404b540aSrobert // USA. 20*404b540aSrobert 21*404b540aSrobert // As a special exception, you may use this file as part of a free software 22*404b540aSrobert // library without restriction. Specifically, if other files instantiate 23*404b540aSrobert // templates or use macros or inline functions from this file, or you compile 24*404b540aSrobert // this file and link it with other files to produce an executable, this 25*404b540aSrobert // file does not by itself cause the resulting executable to be covered by 26*404b540aSrobert // the GNU General Public License. This exception does not however 27*404b540aSrobert // invalidate any other reasons why the executable file might be covered by 28*404b540aSrobert // the GNU General Public License. 29*404b540aSrobert 30*404b540aSrobert /** @file ext/new_allocator.h 31*404b540aSrobert * This file is a GNU extension to the Standard C++ Library. 32*404b540aSrobert */ 33*404b540aSrobert 34*404b540aSrobert #ifndef _NEW_ALLOCATOR_H 35*404b540aSrobert #define _NEW_ALLOCATOR_H 1 36*404b540aSrobert 37*404b540aSrobert #include <new> 38*404b540aSrobert #include <bits/functexcept.h> 39*404b540aSrobert 40*404b540aSrobert _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 41*404b540aSrobert 42*404b540aSrobert using std::size_t; 43*404b540aSrobert using std::ptrdiff_t; 44*404b540aSrobert 45*404b540aSrobert /** 46*404b540aSrobert * @brief An allocator that uses global new, as per [20.4]. 47*404b540aSrobert * 48*404b540aSrobert * This is precisely the allocator defined in the C++ Standard. 49*404b540aSrobert * - all allocation calls operator new 50*404b540aSrobert * - all deallocation calls operator delete 51*404b540aSrobert */ 52*404b540aSrobert template<typename _Tp> 53*404b540aSrobert class new_allocator 54*404b540aSrobert { 55*404b540aSrobert public: 56*404b540aSrobert typedef size_t size_type; 57*404b540aSrobert typedef ptrdiff_t difference_type; 58*404b540aSrobert typedef _Tp* pointer; 59*404b540aSrobert typedef const _Tp* const_pointer; 60*404b540aSrobert typedef _Tp& reference; 61*404b540aSrobert typedef const _Tp& const_reference; 62*404b540aSrobert typedef _Tp value_type; 63*404b540aSrobert 64*404b540aSrobert template<typename _Tp1> 65*404b540aSrobert struct rebind 66*404b540aSrobert { typedef new_allocator<_Tp1> other; }; 67*404b540aSrobert throw()68*404b540aSrobert new_allocator() throw() { } 69*404b540aSrobert throw()70*404b540aSrobert new_allocator(const new_allocator&) throw() { } 71*404b540aSrobert 72*404b540aSrobert template<typename _Tp1> new_allocator(const new_allocator<_Tp1> &)73*404b540aSrobert new_allocator(const new_allocator<_Tp1>&) throw() { } 74*404b540aSrobert throw()75*404b540aSrobert ~new_allocator() throw() { } 76*404b540aSrobert 77*404b540aSrobert pointer address(reference __x)78*404b540aSrobert address(reference __x) const { return &__x; } 79*404b540aSrobert 80*404b540aSrobert const_pointer address(const_reference __x)81*404b540aSrobert address(const_reference __x) const { return &__x; } 82*404b540aSrobert 83*404b540aSrobert // NB: __n is permitted to be 0. The C++ standard says nothing 84*404b540aSrobert // about what the return value is when __n == 0. 85*404b540aSrobert pointer 86*404b540aSrobert allocate(size_type __n, const void* = 0) 87*404b540aSrobert { 88*404b540aSrobert if (__builtin_expect(__n > this->max_size(), false)) 89*404b540aSrobert std::__throw_bad_alloc(); 90*404b540aSrobert 91*404b540aSrobert return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp))); 92*404b540aSrobert } 93*404b540aSrobert 94*404b540aSrobert // __p is not permitted to be a null pointer. 95*404b540aSrobert void deallocate(pointer __p,size_type)96*404b540aSrobert deallocate(pointer __p, size_type) 97*404b540aSrobert { ::operator delete(__p); } 98*404b540aSrobert 99*404b540aSrobert size_type max_size()100*404b540aSrobert max_size() const throw() 101*404b540aSrobert { return size_t(-1) / sizeof(_Tp); } 102*404b540aSrobert 103*404b540aSrobert // _GLIBCXX_RESOLVE_LIB_DEFECTS 104*404b540aSrobert // 402. wrong new expression in [some_] allocator::construct 105*404b540aSrobert void construct(pointer __p,const _Tp & __val)106*404b540aSrobert construct(pointer __p, const _Tp& __val) 107*404b540aSrobert { ::new(__p) _Tp(__val); } 108*404b540aSrobert 109*404b540aSrobert void destroy(pointer __p)110*404b540aSrobert destroy(pointer __p) { __p->~_Tp(); } 111*404b540aSrobert }; 112*404b540aSrobert 113*404b540aSrobert template<typename _Tp> 114*404b540aSrobert inline bool 115*404b540aSrobert operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 116*404b540aSrobert { return true; } 117*404b540aSrobert 118*404b540aSrobert template<typename _Tp> 119*404b540aSrobert inline bool 120*404b540aSrobert operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 121*404b540aSrobert { return false; } 122*404b540aSrobert 123*404b540aSrobert _GLIBCXX_END_NAMESPACE 124*404b540aSrobert 125*404b540aSrobert #endif 126